Assigbtor to sitllivah



Oct. 8, 1929. H. MARSTON ATTACHMENT FOR PERCUSSIVE TOOLS Filed Dec. 31, 1923 Patented Get. 8, 1929 eaten as HOWARD MARSTON', OF CLABEMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, A CQRPOEATION OF MASSACHUSETTS ATTACHMENT FOR PERC USSIVE TOOLS Application filed. December 31, 1928. Serial No. 683,618.

This invention relates to percussive cutting mechanisms. 1

It has for its object to provide an improved means for breaking concrete, cutting 5 asphalt, or operating upon other similar materials. street has been paved and it becomes necessary to tear up the same, for instance, to lay new pipes or repair old ones, it is necessary to cut the pavement by any of several well known methods. One method which has proven very successful is to use a porous sive motor and tool having either a bull point or chisel edge, the latter type of tool being well adapted to cut through the asphalt and into the concrete. It is well known that in the latter operation when the steel has been driven to the required depth the same must be laterally moved in order to allow removal of the steel to start a new cut or to raise the material being cut.

In my improved device I provide means whereby, itdesired, it is not necessary to re; move the tool or stop operation of the motor, thus allowing the same to cut continuously along a predetermined line, or on the other hand, if the steel is to be removed or the material pried up, my improved means will facilitate suchan operation. To accomplish this my invention has for another object to provide improved means which will allow prying action with a fulcrum substantially adjacent the working end of the steel, thus allowing a great leverage. Another object is tg n'ovide in' provedmeans using a percussive type of drilling mechanism. A' iurther object is to provide improved means whereby the depth of the cutting steel will be limited and whereby the same may be readily moved to assist in prying the material that has been out. Another object is to provide improved means detachably mounted on a steel. Another object to provide improved. means whereby a tool retainer maybe used in combination therewith. A still further object is to provide improved means for limiting movement of my prying member relative to the steel durin ope ion. further object to provi unpr- It is well known that when a veal means Star limiting said movement with the aid of the motor casing.

In the accompanying drawings I have shown for purposes of illustration one form which my invention may assume in practice.

In these drawings,

Fig. 1 is a front elevation showing the ing large transverse handles 2 witha usual actuating fluid controlling valve 3 disposed adjacent the same. Mounted upon the lower end of the motor is a usual tool supporting mechanism 5 adapted to receive a steel 6, herein shown as of a hexagonalshaped cross section and having suitable lug means, herein in the form of a collar 7, adapted to limit its inwardmovement and also to engage a tool retainer 8 on its forward movement. The retainer 8 is of standard construction and is adapted to be swung out of alinement'with the collar 7 as by a pivotal connection 9 carried on the lower end of the member 5.

It is to be understood that my improved device can be used wherever'it is desired to break or cut materialin any manner that would require a pryingaction. To accomplish this prying action I provide a fulcrum member 10 having a longitudinal groove 11 within which the steel 6 is disposed and de-v tachably held theretoby clips 12 surrounding the same. The upper end of the member 10 .is adapted to abut against the lower end of the motor 1 and thereby be positively limited in its upward movement although itwill be understood that any other suitable means might be used toaccomplish this limiting action. Suitable recesses 14L and 15 in the upper side of the member 10 receive the collar? and retainer 8. In order to perform the prying action I have shown an enlarged rounded action 16 disposed on the lower end in the cit-the .linhei 19 and adapter.

surface of the material being broken or cut and is also of such width that it will bridge a gap former by a steel having a chisel-like point 17 which is particularly adapted for continuous operation.

In the operation of my device the o aerator will force the steel. with the aid of the drilling motor into the material to bc biOliQl'l or cut and when the same has penetrated so that the portion 16 will en the ce oi the material, the opera-mi pushes the handle down in a direction indicafid by the arrow A in 2 and thus forces the point 17 of the steel upwardly which tends to litt the material and tree the steel t allow the operation to be repeated. During this operation th motor is continuously run and the steel not withdrawn from the material, the prying action being allowed durin continuous operation for the portion 16 tollows the cut and is wide enough to bridge the gap formed by the tool 17. Thus such an operation would be son'ietl'iing like a can opening action. During the prying action the member 10 will tend to be torced upwardly, but such action is prevented by allowing the upper end of the member to come in contact with the end of the motor. It will of course be obvious that it a substantially smooth surface is desired along a predetermined line as B in Fig. 2, t .e operator would make many short prying movements and also that the motorneed not operate during prying, the whole mechanism thus, in effect, being capable of use a crow bar-with an, attached ful crum.

It will thus be seen that I have provided an extremely simple means whereby the motor can be continually operated and the point 17 thus continuously ted along a predetermined line, thereby making a substantially clean surface cut and one having a definite depth, which depth is controlled without any exertion on the part of the operator. \Vhen it is desired to change steels, it only necessary to swing the tool retainer 8 out of alinement with the collar 7, remove the clips 12 which. allows the member 10 to'be removed, an operation requiring only a small interval 01 time.

While I have in this application specifically described one form which my invent-ion may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may he modified and embodied in other forms without departing from its spirit or the scope of the appended claims.

Vi hat I claim as new and desire to secure by Letters Patent is:

1. The combination with a percussive motor, a cutting tool actuated thereby and having a lug formed thereon, and a tool retainer eooperatin with said lug, of means for fulcruming said tool directly on the material to be cut, said means having portions engaging with said lug and retainer.

2. The combination with a percussive motor, a cutting tool actuated thereby and having a lug formed thereon, and a tool retainer cooperating with said lug, of means for iulcruming said tool directly on the material to be cut, said means having portions adapted to receive said lug and retainer and abutting against the body of said motor.

An. attachment for a percussive tool having a steel retainer, compr' fng a fulcrum member about which the tool is adapted. to be-swung, and means for attaching said fulcrum member to the tool conmrising a plurality of spaced supporting clips carried by said member and adapted to surround the steel of the tool and a notch in said fulcrum member adapted to receive a portion of the tool retainer.

a. An attachment for a percussive tool having a collared steel, comprising a fulcrum membe about which the tool is adapted to be swung, and means for attaching said fulcrum member to the tool comprising a plurality of spaced clips carried by said member and adapted to surround the steel oi. the tool, and a notch in said fulcrum member adapted to receive the collar on the steel.

5. JiZLll attachment for a percussive tool having a collared steel and a tool retainer coopcrating therewith, comprising a fulcrum member having means abutting against the body of the tool about which the latter is adapted to be swung, and means for attaching said fulcrum member to the tool comprising a plurality of clips carried by said member and adapted to surround the steel andnotches in said fulcrum member adapted to receive the collar on the steel anda portion of the too]. retainer.

6. The combination with a percussive motor, and a cutting tool actuated thereby hav ing a cutting edge, of means projecting laterally from the tool for providing a bearin g for said tool on the material being cut along a line substantially perpendicular to the cutting edge, whereby the tool may be pivotally moved about an axis extending transversely with respect to said edge and in a plane parallel to a line parallel to said cutting edge.

7. The combination with a percussive motor and a cutting tool actuated thereby and having a straight cutting edge adapted to cut continuously along a predetermined line, of fulcruming means supported on the side of the tool in alinement with the cutting edge thereof, said fulcruming means adapted to engage directly on the surface of the materi al being out along a line substantially perpendicular to the cutting edge to allow said tool to pry material in front thereof and in substantial alinement with said cutting edge.

8. In combination with a percussive motor, a cutting tool actuated thereby having a cutting edge, and means for providing, at a point in advance of the forward end of said motor, a fulcrum for said tool on the material being cut for pivoting the tool about an axis substantially perpendicular to a plane passing through the longitudinal center line of the tool and including said cutting edge, said fulcrum means being adapted to engage the material being out along a line substantially perpendicular to said cutting edge.

9. The combination With a percussive motor, and a cut-ting tool actuated thereby and having a straight cutting edge adapted to cut continuously along a predetermined line, of a fulcrum member, means for detachably mounting said member on said cutting tool, said member abutting against the motor, and said cutting tool being movable longi tudinally relative to said member.

10. The combination with a percussive motor, and a cutting tool actuated thereby and having a straight cutting edge adapted to cut continuously along a predetermined line, of means providing a fulcrum for said tool about an axis extending transversely of said line, said fulcrum member being loosely mounted on said cutting tool and abutting against said motor, whereby said tool is adapted to be pivoted about said fulcrum during a cutting operation.

In testimony whereof I afiix my signature.

HOWARD MARSTON. 

